function f1() {
  console.log("f1 name:", this.name);
}
f1(); // f1 name: undefined
console.log(f1.name); // f1
const f2 = function () {
  console.log("f2 name:", this.name);
};
f2(); // f2 name: undefined
console.log(f2.name); // f2
const o = {
  f3() {},
};
console.log(o.f3.name); // f3
const f4 = () => {};
console.log(f4.name); // f4
const f5 = f4;
console.log(f5.name); // f4
